thomson



(No Model.)

J THOMSON.

COUNTING REGISTER.

Patented Mar. 16, 1886.

INVENTORI WITNESSES:

N. PETERS. Flmln-Liihogmphor. Wnshmgton. uc,

Unrrnn Sari ires PATENT Gin-ten.

JOHN THOMSON, OF BROOKLYN, NEXV YORK.

COUNTENG- REGESTER.

SPECIFICATION forming part 0;" Letters Patent No. 337,890, dated March16, 1826 Application'filcd Apr-i124, 1855.

To aZZ whom, it may concern:

Be it known that 1, JOHN THOMSON, of thecity of Brooklyn, county ofKings, and State of New York, have invented certain new and use fulImprovements in Registers, of which the following is a specification.

This invention refers to registers of that class in which the dial, andalso the hands, which indicate sums of units,are caused to rotatetogether differentially.

The objects of this invention are to simplify and cheapen theconstruction of the register as a whole, and to insure more accurate andquicker readings from the dial than in instruments of this classheretofore.

In the drawings, Figure l is a front elevation. Fig. 2 is a sideelevation. Fig. 3 is a detached view of the dial-wheel and pinion; andFig. 4 is a front elevation similar to Fig. 1, but with the dialrepresented as having completed half of a rotation.

The dial 5 is fast to the dial-wheel G. The dial-wheel is journaled onthe hub 7 of the follower-wheel 8. On the extension of the said hub 7,which projects through the dial, the hand 9 is secured, and the entirestructure rotates upon an axis, as 10, fixedly secured, as in thebase-plate 11. In instance here shown to be assumcd,the pinnary sum ofthe unit-graduation is one hundred; hence the graduation of the dial andthe number of the teeth in the dial-wheel are equal.

In the iollower-wheel 8 are formed one hundred and one teeth. Bothwheels are actuated by common driver, as by the pinion 12. Therefore ifthe relation of the driver to the dial-wheel is such that each unitdesired to be registered shall equal one-hundreth part of a rotation ofthe said dial-wheel, it is clear that any tixed point, as the index 13,will indicate the units, while on the same series of graduations thehand 9 will indicate in sums of one hundred, the latter indication beingdue to the loss of rotation of the follower-wheel u )on the dial-wheel.The sum, then of the indication of hand 9 will equal the product of 100100-namely, 10,000.

The construction and operation as just described is known to be old, andishere stated simply to make clear the manner of obtaining a higherregistration in sums of ten thousand.

Serial No. 163,323. (No model.)

To effect this in a more simple manner than that shown and described inpatent of the United States, dated September 18, 1883, No. 285,322,allowed to me, a pinion or star-wheel, 14, is journaled in thedial-wheel, the pivot of which, 15, projects through the dial andcarries a hand, 16, which indicates on the integral graduation 17. Thesum of this graduation and the number of teeth or spurs in the starwheelare equal. The starwheel revolves with the dial-wheel between the saiddiatwheel and the follower-wheel.

From the inner face of the follower-Wheel projects a pin, tooth, orspur, 18, of such height or length and relatively so located that itwill properly engage the star-wheel to rotate the same the space of onetooth during each engagement. Therefore as thefollowerwheel will losebut one revolution (littered tially upon the dial-wheel during a totalof one hundred revolutions of the said dialwheel, and as this willeffect a degree of revolution of the star-wheel equal to the space ofone of its'teeth, the hand 16 will thus register the total sum of theindication of hand 9, and as the sum of the integral graduation 17 hereshown is ten. the total. reading equals the product of 100100X10-namely, 100,000.

As the eng ent 01' the star-wheel and the tooth which actuates it occursintermitt-iugly but once during one hundred revolutions of the dial, thestar-wheel requires suifi cient friction to held against accidental displacement. This may be obtained by a washer, as 22, by friction in thebearing or direct impingement of a spring. This arrangement of thestar-wheel on the dial-wheel and the tooth on the follower-wheel toengage the star-wheel comprises the simplest form of an epicycletrain ofgearing, although, as a matter of fact, the actual engagement of thetrain is intermitting.

For many purposes it is not necessary to register units, sums of ten,and, in more rare instances, sums of one hundred, being sufficientlysmall. In such instances I simply change the value oi the maingraduation,

marking it 100 or 1,000 where now shown as 10, and so on, when the totalreadings, respectively, without changing the figures of the integraldial,would equal sums of one million and ten millions. It is also quitewithin means for indication, as the graduation 17, the limits ofpractice to double the sum of the substantially as described.

integral graduation herein shown and pri- In testimony whereof I havesigned my name marily described by simply increasing the to thisspecification in the presence of two sub-. 5 number of teeth in thestar-wheel. scribing witnesses.

I c1aim- I The combination, with the pair of differen- JOHN IHOMSON'tial gear-wheels and means for operating the Witnesses: same, of thetooth, as 18, the star-wheel 14, L. H. EssEX,

IO the hand l6, attached to the star-wheel, and JOHN A. OBRIEN.

